shake·down 
(shākdoun′)
(shākdoun′)n.
1. Slang Extortion of money, as by blackmail.
2. Slang A thorough search of a place or person.
3. A test or period of appraisal followed by adjustments to improve efficiency or functioning.
adj.
Serving as a test of a new product or model, especially of a vehicle, ship, or aircraft: a shakedown cruise; a shakedown flight.